Boring-tool.



PATENTED MAY 12, 1903.

G. R, RICH. BORING TOOL.

APPLIOATION FILED MAY 31,1902.

N0 MODEL.

mm a W.

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UMTED STATES Patented May 12, 1903.

PATENT OFFICE.

GEORGE R. RICH, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE GEORGE R.

RICH MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

BORING-TOOL. '2

SPECIFICATION forming part of Letters Patent No. 728,013,dated May 12, 1903.

Application filed May 31, 1902. Serial No- 109,607, (No model.)

To all whom it may concern: 7

Be it known that I, GEORGE E. RICH, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boring-Tools, of which the following is a specification.

My invention relates to certain new and useful improvements in boring-tools for use on machine-lathes or other similar machinery; and its object is to provide a device of this class which shall be simple and cheap and which shall be more effective than the devices heretofore in use. It has been customaryin the past to use an L-shaped tool, and owing to the obvious mechanical disadvantages of such a structure any attempt to cut a large shaving resulted in breaking it or, at least, in bending it out of shape. For this reason it has been necessary to take off a small shaving at each operation, and this necessitated several repetitions of the boring process before any considerable amount of material could be removed.

The object of my invention is primarily to produce a tool which shall have no tendency to break whatever the size of the shaving is and which shall be capable of taking so large a shaving that under ordinary circumstances only one operation will be necessary.

To these and certain" minor ends myinveu-- tion consists in certain novel features of construction, shown in the accompanying drawings, and fully describedin the specification.

In the drawings, Figure 1 is an elevation of a machinelathe of the ordinary type with my improved boring-tool thereon. Fig. 2 is a section in'the line 2 2 of Fig; 1, showing the construction of the boring-tool and its position relative to the chuck and tail-stock of the lathe and the material operated on. Fig. 3 is a perspective of the cutting bar or tool proper. guide and a portion of the tool as it is used when a conical hole is to be cut. Fig. 5 is a perspective of a portion of the tool, showing the means bywhich the cutting-bar is held in place; and Fig. 6 is a plan, with certain parts in section, of a portion of a lathe and tool when cutting a conical hole.

"the inside before the boring is begun.

Fig. 4 is a perspective of the tool- .butof greater radial extent.

Referring to Fig. l, A is a machine-lathe of the ordinary type, having a chuck B, a tail-stock C, and a feed-slide D, all of the ordinary type.

E is the material which itis desired to bore, and, as is customary in such cases, it is finished onthe outside and suitably cored oAn shaft F extends through the cored hole in the material E from the chuck center (designated by f) to the tail-stock center, (designated,

by c.) This shaft is provided with a longitudinal slotf', the purpose of which will presently be apparent. Upon the shaft F is a sleeve G, substantially of the form shown in Fig. 2, andthissleeve has at the end nearest the tail-stock a brace G, which is shown in Figs. 2 and 4, said brace being secured by a set-screw cl to the top of the feed-slide D. The brace is secured to the sleeve G by screws 9. The'end of the sleeve G nearest to the chuck is pierced by two preferably rectangular holes 9. gin line with each other, these holes being adapted to receive the cuttingtool H. This fits the holes closelyand is held in place by two set-screws 9 The tool H is constructed as shown in Fig. 3, and it has two cutting edges h h at the opposite ends and also upon opposite sides, of the tool. One edge h of the tool istapered off at 71, Fig. 3, so that when in operation the face 71 will take 0d a slightly-thinner shaving than will the cuttingface h.

The tool H is not centrally placed with respect to the sleeve; but the end h is placed farther from the center than is the end h. This relation is clearly shown in Fig. 2, and it will be evident therefromithat the end h cuts off quite a thick shaving, but of a small radial extent. Then as the material E revolves past the end h it meets the end 71/, which takes off a shaving somewhat thinner, In other words,

one of the ends cuts immediately afterthe other, and they take off two shavings, which together makea cut of any desired thickness. The cutting-tool H extends through the slot f in the shaft F, heretofore referred to, and it is fed along by the feed-slide D.

The advantage of this tool over the L- shaped tool heretofore in use lies in the following circumstances: In the first place, the tool is cutting at the same time on opposite sides of the center, and for that reason there is no strain upon the supporting-shaft, so that there is no tendency to breakage.

The second advantage of this tool lies in the fact that one end of the tool takes off approximately half of the shaving and the other end takes off the remainder thereof. The result of this is that a great deal larger shaving can be taken ofi than with any form of cutter in common use. I have succeeded with this tool in making a cut seven-eighths of an inch broad upon an ordinary lathe. This of course is as large a hole as it is usually desired to make, and so instead of having to run the tool several times through the hole to bring it to the proper size I accomplish the same result with one operation.

When itis desired to cut a beveled hole, as shown in Fig. 6, the tail-stock is moved to one side or the other, and a sleeve G is slipped over the guide G and is clamped in the feedslide. This permits a slight angular movement between the feed slide and the toolholder.

I realize that considerable changes can be made in the details of this construction without materially departing from the spirit of the invention, and I do not, therefore, desire to limit myself to the specific form shown herein.

I claim as new and desire to secure by Letters Patent- In a device of the class described, the combination with a chuck and a tool-holder, of a tool supported thereby and extending unequally on opposite sides thereof, the end of GEORGE R. RICH.

\Vitnesses:

E. W. WASHBURN, CHAS. l-I. TIFFANY. 

